film – Why did my night pictures turned out so foggy, light or too bright?

I received my developed pictures and many of them are foggy. It seems that some shot with similar light is foggier than the others. Can it be that something went wrong in the development process, is it because they tried to compensate for the lack of light, or did I set the camera wrong?

Any ideas how I can fix it?
enter image description here

Cheers!